NCERT Solutions for Chapter: Pollution of Air and Water, Exercise 4: LONG ANSWER QUESTIONS

It is said, “${\mathrm{CO}}_2$ contributes to global warming.” Explain.

 We should plant trees and nurture the ones already present in the neighbourhood. Why?
 

Explain the traditional way of purifying water to make it fit for drinking.

How can we reduce, reuse and recycle water?
 

Read the paragraph and answer the given question.
Water is essential for life. Without water, there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to ground, water. Easily identified source or place of pollution is called a point source, example.– municipal and industrial discharge pipes, where pollutants enter the water source. Non–point sources of pollution are those where a source of pollution cannot be easily identified, example.– agricultural runoff, acid rain etc.

 How do you classify the various sources of water pollution?

Read the paragraph and answer the questions following it.
Water is essential for life. Without water, there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called a point source, example.– municipal and industrial discharge pipes, where pollutants enter the water source. Nonpoint sources of pollution are those where a source of pollution cannot be easily identified, example.– agricultural runoff, acid rain etc.

 What are the point sources of water pollution?

Read the paragraph and answer the questions following it.
Water is essential for life. Without water, there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called a point source, example.– municipal and industrial discharge pipes, where pollutants enter the water source. Nonpoint sources of pollution are those where a source of pollution cannot be easily identified, example.– agricultural runoff, acid rain etc.

 Name any two nonpoint sources of water pollution?

Complete the crossword puzzle with the help of the clues given below:
 

Across
1. Pollutant which was used in refrigerators and air conditioners. (18)

3. Produced on incomplete combustion of fuels. (14) 

6. This chemical protects our crops and is washed into water bodies from the field. (9)

Down
2. This layer protects us from harmful UV rays. (5)

4. It is essential for combustion. (6)

5. Disease which is caused by drinking contaminated water. (7).

7. River which is famous in India and sustains most of the Northern, Central and Eastern Indian population.